Size Guide

All rings are made in standard Japanese sizes (JCS). Please refer to the chart below for international size conversions.

If your size is not available, please feel free to contact our customer support.

Your first ring resizing after purchase is free of charge.

JP US Inner Circumference (mm) Diameter (mm)
1 39.1 12.45
1.5 40.38 12.85
1 40.84 13
2 41.65 13.26
2 41.89 13.33
2.5 42.93 13.67
3 42.94 13.67
4 43.98 14
3 44.21 14.07
5 45.03 14.33
3.5 45.48 14.48
6 46.08 14.67
4 46.76 14.88
7 47.12 15
4.5 48.04 15.29
8 48.17 15.33
9 49.22 15.67
5 49.31 15.7
10 50.27 16
5.5 50.59 16.1
11 51.31 16.33
6 51.87 16.51
12 52.36 16.67
6.5 53.14 16.92
13 53.41 17
7 54.42 17.32
14 54.45 17.33
15 55.5 17.67
7.5 55.7 17.73
16 56.55 18
8 56.97 18.14
17 57.6 18.33
8.5 58.25 18.54
18 58.64 18.67
9 59.53 18.95
19 59.69 19
20 60.74 19.33
9.5 60.8 19.35
21 61.78 19.67